<!--  -->
<template>
<div>
     <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb> 

    <!-- 卡片视图 -->
    <el-card>
        <!-- 警告栏 -->
        <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
        <!-- 步骤栏 -->
        <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
        </el-steps>
        <!-- 左侧tab -->
        <!-- 点击哪个tab-pane，就会将哪个的name自动传入v-model中，v-model就是用来展现激活状态的 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
            <el-tabs v-model="activeIndex" :tab-position="'left'" 
            :before-leave="beforeTabLeave"
            @tab-click="tabClickes">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                        <el-cascader
                            v-model="addForm.goods_cat"
                            :options="catelist"
                            :props="{ expandTrigger: 'hover', label:'cat_name' ,value:'cat_id', children:'children' }"
                            @change="handleChange">
                        </el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                    <!-- 渲染表单的item项 其实就相当于不同的item项放在了不同的tabs标签页里 -->
                    <el-form-item v-for="item in manyTableData" :key="item.attr_id" :label="item.attr_name">
                        <!-- 复选框组 -->
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border>
                            </el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item v-for="item in onlyTableData" :key="item.attr_id" :label="item.attr_name">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                    <!-- action 表示图片要上传的后台api地址 -->
                    <el-upload
                        action="http://127.0.0.1:8888/api/private/v1/upload"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture"
                        :headers="headersObj"
                        :on-success="handlesuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                    </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                    <quill-editor v-model="addForm.goods_introduce">
                    </quill-editor>
                    <el-button type="primary" class="editbtn" @click="add">添加商品</el-button>
                </el-tab-pane>
            </el-tabs>
        </el-form>
    </el-card>
</div>
</template>

<script>
import _ from 'lodash'
export default {
    data() {
        return {
            //steps默认第几步
            activeIndex:0,
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                goods_cat:[],
                pics:[],
                goods_introduce:'',
                attrs:[]
                },
            addFormRules:{
                goods_name:[
                    { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price:[
                    { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_weight:[
                    { required: true, message: '请输入商品重量', trigger: 'blur' }
                ],
                goods_number:[
                    { required: true, message: '请输入商品数量', trigger: 'blur' }
                ],
                goods_cat:[
                    { required: true, message: '请输入商品数量', trigger: 'blur' }
                ]
            },
            //获取所有商品分类数据 用于级联选择器
            catelist:[],
            //动态参数列表数据，在点击tabs标签页时发出请求
            manyTableData:[],
            onlyTableData:[],

            headersObj:{
                Authorization:window.sessionStorage.getItem('token')
            }
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        //获取所有商品分类数据
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status != 200)
                return this.$message.error("获取商品列表失败");
            this.catelist = res.data
        },
        // 级联选择器选中项发生变化时，就会被触发
        handleChange(){
            // 级联选择器选择范围的控制
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
            }
        },
        // tabs标签页发生改变时，离开一个标签页取代另一个标签页上
        beforeTabLeave(activeName,oldActiveName){
            if(oldActiveName==='0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请先选择商品分类')
                return false
            }
        },
        async tabClickes(){
            // 访问动态参数面板
            if(this.activeIndex === '1'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
                if(res.meta.status != 200)
                    return this.$message.error("获取动态商品参数列表失败");
                res.data.forEach(item => {
                    item.attr_vals=
                    item.attr_vals.length === 0?[] : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            }
            //访问静态属性面板
            if(this.activeIndex === '2'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
                if(res.meta.status != 200)
                    return this.$message.error("获取静态商品属性列表失败");
                this.onlyTableData = res.data
            }
        },
        // 处理图片预览效果
        handlePreview(){

        },
        // 处理移除图片的操作
        handleRemove(file){
            const filePath = file.response.data.tmp_path
            const i = this.addForm.pics.findIndex((x)=>{
                x.pic === filePath
            })
            this.addForm.pics.splice(i,1)
        },
        // 监听图片上传成功时的事件
        handlesuccess(response){
            // 图片信息对象
            const picInfo = {
                pic: response.data.tmp_path
            }
            // 将图片信息对象push到pics中，这样在表单中就存放了图片暂时在浏览器存放的位置(临时存放路径)
            this.addForm.pics.push(picInfo)
        },
        add(){
            this.$refs.addFormRef.validate(async (valid)=>{
                if(!valid) return
                const from = _.cloneDeep(this.addForm)
                from.goods_cat = from.goods_cat.join(',')
                this.manyTableData.forEach(item=>{
                    const newInfo = {attr_id: item.attr_id,
                    attr_value :item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                this.onlyTableData.forEach(item =>{
                    const newInfo = {attr_id:item.attr_id,
                    attr_value:item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                from.attrs = this.addForm.attrs

                const {data:res} = await this.$http.post('goods',from)
                if(res.meta.status != 201)
                    return this.$message.error("获取商品列表失败");
                this.$message.success('成功')
                this.$router.push('/goods')

            })
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style  lang='less' scoped>
.el-checkbox{
    margin: 0 5px 0 0 !important;
}
.editbtn{
    margin: 15px 0;
}
</style>